[PATCH 4/6] sd: inform block layer of write cache state

From: Jens Axboe
Date: Tue Mar 22 2016 - 13:56:42 EST


Signed-off-by: Jens Axboe <axboe@xxxxxx>
---
drivers/scsi/sd.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5a5457ac9cdb..049f424fb4ad 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -192,6 +192,7 @@ cache_type_store(struct device *dev, struct device_attribute *attr,
sdkp->WCE = wce;
sdkp->RCD = rcd;
sd_set_flush_flag(sdkp);
+ blk_queue_write_cache(sdp->request_queue, wce != 0);
return count;
}

@@ -2571,7 +2572,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
sdkp->DPOFUA ? "supports DPO and FUA"
: "doesn't support DPO or FUA");

- return;
+ goto done;
}

bad_sense:
@@ -2596,6 +2597,8 @@ defaults:
}
sdkp->RCD = 0;
sdkp->DPOFUA = 0;
+done:
+ blk_queue_write_cache(sdp->request_queue, sdkp->WCE != 0);
}

/*
--
2.4.1.168.g1ea28e1